#import <AppKit/AppKit.h>

struct pair {
  double x;
  double y;
};

@interface SomeClass : NSObject
- (struct pair)doit;
@end

@implementation SomeClass
- (struct pair)doit {
  return (struct pair){42, 69};
}
@end

struct pair foo (SomeClass *q) {
  return [q doit];
}

extern void hey (SomeClass *object, SEL sel);

int main (void) {
  SomeClass *q = [[SomeClass alloc] init];
  struct pair r;
  r = [q doit];

  printf("We got { %g, %g }\n", r.x, r.y);

  hey(q, @selector(doit));

  return 0;
}

// cc -o foo foo.m bar.c -lobjc && ./foo